High-pressure tank and manufacturing method of the same

A manufacturing method of a high-pressure tank which is a method of manufacturing a high-pressure tank including:

• a resin liner constituting a hollow fluid filling part;
• a ferrule including a supply/discharge port which communicates with an internal space of the liner and a flange part which protrudes outward in a radial direction from a circumferential region of the supply/discharge port and abuts on the liner;
• and
• a reinforcing layer made of a fiber reinforced resin attached to cover across the liner and an outer circumferential surface of the flange part,
• the manufacturing method of a high-pressure tank comprising:
• a step of forming a discharge hole which allows an abutting surface of the flange part with respect to the liner to communicate with an inside of the supply/discharge port in the ferrule;
• a step of forming a trap groove which surrounds a circumferential region of the discharge hole on at least any one of the abutting surface on the flange part and the abutting surface on the liner;
• a step of forming a protruding part which surrounds the circumferential region of the discharge hole on an inner side of the trap groove and presses against the other of the abutting surfaces on any one of the abutting surfaces of the flange part and the liner;
• a step of assembling the ferrule to the liner;
• a step of attaching reinforced fibers impregnated with a base resin to cover the liner and the outer circumferential surface of the flange part of the ferrule;
• a step of obtaining the reinforcing layer by curing the base resin;
• a step of forming a communication hole which allows a bottom portion of the trap groove to communicate with an end surface of the ferrule on an outer side in an axial direction in the ferrule before the ferrule is assembled to the liner;
• and
• a step of filling a filler into the trap groove through the communication hole.